[go: up one dir, main page]

WO2011091252A3 - Système séismique doté d'un pouvoir de rejet de mouvements et de réflexions fantômes - Google Patents

Système séismique doté d'un pouvoir de rejet de mouvements et de réflexions fantômes Download PDF

Info

Publication number
WO2011091252A3
WO2011091252A3 PCT/US2011/022059 US2011022059W WO2011091252A3 WO 2011091252 A3 WO2011091252 A3 WO 2011091252A3 US 2011022059 W US2011022059 W US 2011022059W WO 2011091252 A3 WO2011091252 A3 WO 2011091252A3
Authority
WO
WIPO (PCT)
Prior art keywords
motion
noise
ghost
sensor
seismic system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2011/022059
Other languages
English (en)
Other versions
WO2011091252A2 (fr
Inventor
Dale J. Lambert
Andre W. Olivier
Robert E. Rouquette
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ion Geophysical Corp
Original Assignee
Ion Geophysical Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ion Geophysical Corp filed Critical Ion Geophysical Corp
Priority to CN201180013927.3A priority Critical patent/CN102812382B/zh
Priority to CA2787296A priority patent/CA2787296C/fr
Priority to EP11701727.7A priority patent/EP2526444B1/fr
Priority to RU2012134326/28A priority patent/RU2546997C2/ru
Publication of WO2011091252A2 publication Critical patent/WO2011091252A2/fr
Anticipated expiration legal-status Critical
Priority to DKPA201270479A priority patent/DK201270479A/da
Publication of WO2011091252A3 publication Critical patent/WO2011091252A3/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
    • G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
    • G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
    • G01V1/189—Combinations of different types of receiving elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
    • G01V1/36—Effecting static or dynamic corrections on records, e.g. correcting spread; Correlating seismic signals; Eliminating effects of unwanted energy
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V2210/00—Details of seismic processing or analysis
    • G01V2210/10—Aspects of acoustic signal generation or detection
    • G01V2210/14—Signal detection
    • G01V2210/144—Signal detection with functionally associated receivers, e.g. hydrophone and geophone pairs
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V2210/00—Details of seismic processing or analysis
    • G01V2210/50—Corrections or adjustments related to wave propagation
    • G01V2210/56—De-ghosting; Reverberation compensation

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Acoustics & Sound (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Oceanography (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

La présente invention concerne un système séismique sous-marin destiné à réduire le bruit dû aux mouvements ou aux réflexions fantômes à travers l'eau provenant de signaux séismiques. Le système comprend deux capteurs de mouvement. Un capteur, sensible au bruit induit par le mouvement de la plateforme ainsi qu'aux ondes acoustiques, donne une première réponse. L'autre capteur présente une construction différente l'isolant des ondes acoustiques, de façon à ce que sa réponse cible principalement le bruit dû aux mouvements. Les sorties des deux réponses des capteurs sont combinées afin d'éliminer les effets du bruit dû aux mouvements. Une fois combiné avec un signal d'hydrophone, le bruit dû aux réflexions fantômes est réduit.
PCT/US2011/022059 2010-01-22 2011-01-21 Système séismique doté d'un pouvoir de rejet de mouvements et de réflexions fantômes Ceased WO2011091252A2 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201180013927.3A CN102812382B (zh) 2010-01-22 2011-01-21 抑制重影和运动的地震系统
CA2787296A CA2787296C (fr) 2010-01-22 2011-01-21 Systeme seismique dote d'un pouvoir de rejet de mouvements et de reflexions fantomes
EP11701727.7A EP2526444B1 (fr) 2010-01-22 2011-01-21 Système sismique avec un rejet de mouvements et des réflexions fantômes
RU2012134326/28A RU2546997C2 (ru) 2010-01-22 2011-01-21 Сейсмическая система с режекцией волны-спутника и движения
DKPA201270479A DK201270479A (en) 2010-01-22 2012-08-15 Seismic system with ghost and motion rejection

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US29765610P 2010-01-22 2010-01-22
US61/297,656 2010-01-22

Publications (2)

Publication Number Publication Date
WO2011091252A2 WO2011091252A2 (fr) 2011-07-28
WO2011091252A3 true WO2011091252A3 (fr) 2012-09-20

Family

ID=44307598

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2011/022059 Ceased WO2011091252A2 (fr) 2010-01-22 2011-01-21 Système séismique doté d'un pouvoir de rejet de mouvements et de réflexions fantômes

Country Status (6)

Country Link
US (2) US8730766B2 (fr)
EP (1) EP2526444B1 (fr)
CA (1) CA2787296C (fr)
DK (1) DK201270479A (fr)
RU (1) RU2546997C2 (fr)
WO (1) WO2011091252A2 (fr)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2456313B (en) * 2008-01-10 2010-05-12 Westerngeco Seismic Holdings Sensor devices
US8456950B2 (en) * 2010-07-30 2013-06-04 Pgs Geophysical As Method for wave decomposition using multi-component motion sensors
CN103168254B (zh) 2010-09-02 2017-03-29 离子地球物理学公司 多分量声波传感器和方法
US20130044565A1 (en) * 2011-08-15 2013-02-21 Frederick James Barr Piezoelectric sensors for geophysical streamers
US20130083622A1 (en) * 2011-09-30 2013-04-04 Cggveritas Services Sa Underwater node for seismic surveys
WO2014058472A1 (fr) * 2012-10-11 2014-04-17 Silicon Audio Inc. Techniques de commande en boucle fermée pour capteurs de déplacement avec lecture optique
US11209562B2 (en) 2012-11-09 2021-12-28 Shell Oil Company Method for deghosting seismic data acquired by a marine seismic source and receiver assembly
US9841519B2 (en) 2013-03-14 2017-12-12 Ion Geophysical Corporation Seismic sensor devices, systems, and methods including noise filtering
US9678235B2 (en) * 2013-07-01 2017-06-13 Pgs Geophysical As Variable depth multicomponent sensor streamer
WO2015048494A1 (fr) * 2013-09-26 2015-04-02 Ion Geophysical Corporation Détecteur sismique à capteurs de mouvement pouvant réduire le bruit
WO2015168130A1 (fr) 2014-04-28 2015-11-05 Westerngeco Llc Reconstruction de champs d'ondes
US10132946B2 (en) * 2014-08-13 2018-11-20 Pgs Geophysical As Methods and systems that combine wavefields associated with generalized source activation times and near-continuously recorded seismic data
EP3289389A4 (fr) * 2015-05-01 2019-05-29 Schlumberger Technology B.V. Étude par source directionnelle à vibrateur marin
US10996359B2 (en) 2015-05-05 2021-05-04 Schlumberger Technology Corporation Removal of acquisition effects from marine seismic data
CA2990830A1 (fr) 2015-07-07 2017-01-12 Ion Geophysical Corporation Nƒud sismique remorque
EP3368923B1 (fr) * 2015-10-30 2023-12-27 TGS-NOPEC Geophysical Company Accéléromètre à masse unique multi-axial
MX392202B (es) 2015-12-02 2025-03-21 Schlumberger Technology Bv Tendido de sensores sismicos terrestres con pares de sensores sismicos de multiples componentes adyacentes en promedio a una distancia de al menos veinte metros.
WO2017127507A1 (fr) 2016-01-19 2017-07-27 Ion Geophysical Corporation Navire sans équipage pour le déploiement et la récupération de nœuds
RU2744984C2 (ru) 2016-02-26 2021-03-17 Ион Джиофизикал Корпорейшн Система регулирования переменной плавучести и подъема к поверхности для обеспечения регистрации сейсмических данных
EP3440483B1 (fr) 2016-04-07 2021-11-24 ION Geophysical Corporation Navire marin sans équipage pour sources sismiques
WO2017218723A1 (fr) * 2016-06-15 2017-12-21 Schlumberger Technology Corporation Systèmes et procédés pour acquérir des données sismiques conjointement avec des données de gradient
US10534099B2 (en) 2016-10-19 2020-01-14 Pgs Geophysical As Matching combined sensitivities of arrays of hydrophones
US10557749B2 (en) 2016-10-19 2020-02-11 Pgs Geophysical As Isolating a portion of electric potentials generated by a hydrophone indicative of particle motion or pressure
GB2583646B (en) * 2017-12-15 2023-01-18 Pgs Geophysical As Seismic pressure and acceleration measurement
EP3850373B1 (fr) 2018-09-13 2025-01-01 TGS-NOPEC Geophysical Company Accéléromètre à masse unique multi-axial
US20220206181A1 (en) * 2019-04-26 2022-06-30 King Abdullah University Of Science And Technology Submersible sensing system for water and sediment monitoring
RU2724964C1 (ru) * 2019-12-10 2020-06-29 федеральное государственное автономное образовательное учреждение высшего образования "Московский физико-технический институт (национальный исследовательский университет)" Цифровой регистрирующий модуль для подводных исследований
EP4088145A4 (fr) * 2020-01-09 2024-02-07 Services Pétroliers Schlumberger Systèmes et procédés pour effectuer une étude sismique dans des zones d'eau peu profondes
US11156734B1 (en) * 2020-04-27 2021-10-26 Integral Consulting Inc. Vector sensor-based acoustic monitoring system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3283293A (en) * 1964-02-13 1966-11-01 Sonic Engineering Company Particle velocity detector and means for canceling the effects of motional disturbances applied thereto
US3299397A (en) * 1965-03-08 1967-01-17 Sonic Engineering Company Underwater detector streamer apparatus for improving the fidelity of recorded seismic signals
US6512980B1 (en) * 1999-10-19 2003-01-28 Westerngeco Llc Noise reference sensor for use in a dual sensor towed streamer
US7167413B1 (en) * 2006-05-01 2007-01-23 Input/Output Towed streamer deghosting
US7239577B2 (en) * 2002-08-30 2007-07-03 Pgs Americas, Inc. Apparatus and methods for multicomponent marine geophysical data gathering
WO2007149702A2 (fr) * 2006-06-23 2007-12-27 Geco Technology B.V. Estimation de bruit dans une flûte marine à détection de vecteur

Family Cites Families (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3290645A (en) * 1964-02-13 1966-12-06 Whitehall Electronics Corp Method and underwater streamer apparatus for improving the fidelity of recorded seismic signals
US3860899A (en) * 1968-10-08 1975-01-14 Us Navy Strum noise reducing device
US3911388A (en) * 1973-09-21 1975-10-07 Houston Products And Services Accelerometer
US4135141A (en) * 1977-03-01 1979-01-16 Whitehall Corporation Marine seismic streamer with depth sensor calibrating means
US4486865A (en) * 1980-09-02 1984-12-04 Mobil Oil Corporation Pressure and velocity detectors for seismic exploration
US4345473A (en) * 1980-11-26 1982-08-24 Shell Oil Company Vertical component accelerometer
US4477887A (en) * 1981-09-08 1984-10-16 Shell Oil Company Low noise mounting for accelerometer used in marine cable
US4437175A (en) * 1981-11-20 1984-03-13 Shell Oil Company Marine seismic system
US4520467A (en) * 1982-03-18 1985-05-28 Shell Oil Company Marine seismic system
US4821241A (en) * 1988-05-23 1989-04-11 Teledyne Exploration Co. Noise-cancelling streamer cable
US4935903A (en) * 1989-05-30 1990-06-19 Halliburton Geophysical Services, Inc. Reinforcement of surface seismic wavefields
EG19158A (en) * 1989-08-25 1996-02-29 Halliburton Geophys Service System for attenuation of water-column reverberation
NO168610C (no) * 1989-10-26 1992-03-11 Norske Stats Oljeselskap Seismisk kabel
JP3178859B2 (ja) * 1991-06-05 2001-06-25 株式会社東芝 ランダムアクセスメモリ装置およびそのパイプライン・ページモード制御方法
US5621699A (en) * 1995-07-07 1997-04-15 Pgs Ocean Bottom Seismic, Inc. Apparatus and method of calibrating vertical particle velocity detector and pressure detector in a sea-floor cable with in-situ passive monitoring
US5621700A (en) * 1996-05-20 1997-04-15 Schlumberger Technology Corporation, Geco-Prakla Div. Method for attenuation of reverberations using a pressure-velocity bottom cable
RU2136019C1 (ru) 1998-05-21 1999-08-27 Зархин Валерий Иосифович Шланговая гидрофонная секция буксируемого стримера
US6172940B1 (en) * 1999-01-27 2001-01-09 The United States Of America As Represented By The Secretary Of The Navy Two geophone underwater acoustic intensity probe
GB9906456D0 (en) * 1999-03-22 1999-05-12 Geco Prakla Uk Ltd Method and system for reducing effects of sea surface ghost contamination in seismic data
US6205403B1 (en) * 1999-04-30 2001-03-20 Baker Hughes Incorporated Method for determining horizontal geophone orientation in ocean bottom cables
US6539308B2 (en) 1999-06-25 2003-03-25 Input/Output Inc. Dual sensor signal processing method for on-bottom cable seismic
US20050194201A1 (en) * 2004-03-03 2005-09-08 Tenghamn Stig R.L. Particle motion sensor for marine seismic sensor streamers
US7926614B2 (en) * 2004-03-03 2011-04-19 Pgs Americas, Inc. Particle motion sensor mounting for marine seismic sensor streamers
US7359283B2 (en) 2004-03-03 2008-04-15 Pgs Americas, Inc. System for combining signals of pressure sensors and particle motion sensors in marine seismic streamers
US20060133202A1 (en) * 2004-12-22 2006-06-22 Tenghamn Stig R L Motion sensors in a marine seismic streamer
US20060193203A1 (en) * 2005-02-16 2006-08-31 Tenghamn Stig R L Apparatus for attenuating noise in marine seismic streamers
US8477561B2 (en) * 2005-04-26 2013-07-02 Westerngeco L.L.C. Seismic streamer system and method
US7468932B2 (en) * 2005-05-13 2008-12-23 Pgs Americas, Inc. System for noise attenuation in marine seismic streamers
US20070064528A1 (en) * 2005-09-12 2007-03-22 Metzbower D R Marine seismic streamer and method for manufacture thereof
US7623414B2 (en) * 2006-02-22 2009-11-24 Westerngeco L.L.C. Particle motion vector measurement in a towed, marine seismic cable
US7548486B2 (en) * 2006-05-08 2009-06-16 Pgs Geophysical As System for reducing towing noise in marine seismic survey streamers
US7460434B2 (en) * 2006-06-22 2008-12-02 Pgs Geophysical As Marine seismic streamer having soluble encapsulant surrounding seismic sensors therein
US7379386B2 (en) * 2006-07-12 2008-05-27 Westerngeco L.L.C. Workflow for processing streamer seismic data
US7298672B1 (en) * 2006-08-22 2007-11-20 Pgs Geophysical Marine seismic streamer having acoustic isolation between strength members and sensor mounting
US20080072671A1 (en) * 2006-09-26 2008-03-27 Eldon Eller Leveraged shear mode accelerometers
WO2008076191A2 (fr) * 2006-12-15 2008-06-26 Exxonmobil Upstream Research Company Identification et suppression de données sismiques multiples du fond de l'océan
US8593907B2 (en) * 2007-03-08 2013-11-26 Westerngeco L.L.C. Technique and system to cancel noise from measurements obtained from a multi-component streamer
US20080253226A1 (en) * 2007-04-11 2008-10-16 Stig Rune Lennart Tenghamn System and method for marine seismic surveying
US20090040872A1 (en) * 2007-08-09 2009-02-12 Jahir Pabon Removing Vibration Noise from Multicomponent Streamer Measurements
US8553490B2 (en) * 2007-11-09 2013-10-08 Pgs Geophysical As Array grouping of seismic sensors in a marine streamer for optimum noise attenuation
US20090161487A1 (en) * 2007-12-19 2009-06-25 Per Kjellgren Technique and system to cancel noise in measurements provided by sensors of a multi-component streamer
US9291731B2 (en) * 2008-05-29 2016-03-22 Westerngeco L.L.C Noise reduction in particle motion sensing seismic streamer
US20100039889A1 (en) * 2008-08-17 2010-02-18 Oeyvind Teigen Mounting a seismic sensor in a cable
US20100039890A1 (en) * 2008-08-18 2010-02-18 Gary John Tustin Seismic data acquisition assembly
US7929373B2 (en) * 2008-11-19 2011-04-19 Pgs Geophysical As Method of wavefield extrapolation for single-station, dual-sensor towed streamer signals
US9207340B2 (en) * 2008-12-26 2015-12-08 Pgs Geophysical As Marine seismic streamer cable with noise suppressing sensor support
US9829595B2 (en) * 2009-02-06 2017-11-28 Westerngeco L.L.C. Particle motion sensor-based streamer positioning system
US10031247B2 (en) * 2009-02-11 2018-07-24 Westerngeco L.L.C. Using a rotation sensor measurement to attenuate noise acquired by a streamer-disposed sensor
US8588026B2 (en) * 2009-08-21 2013-11-19 Westerngeco L.L.C. Apparatus and method for decoupling a seismic sensor from its surroundings
US20110273957A1 (en) * 2009-08-21 2011-11-10 Fabien Guizelin Apparatus and Method for Decoupling a Seismic Sensor From Its Surroundings
RU2569414C2 (ru) * 2010-01-19 2015-11-27 Ион Геофизикал Корпорейшн Система шумоподавления со сдвоенным датчиком для подводной сейсмоприемной косы

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3283293A (en) * 1964-02-13 1966-11-01 Sonic Engineering Company Particle velocity detector and means for canceling the effects of motional disturbances applied thereto
US3299397A (en) * 1965-03-08 1967-01-17 Sonic Engineering Company Underwater detector streamer apparatus for improving the fidelity of recorded seismic signals
US6512980B1 (en) * 1999-10-19 2003-01-28 Westerngeco Llc Noise reference sensor for use in a dual sensor towed streamer
US7239577B2 (en) * 2002-08-30 2007-07-03 Pgs Americas, Inc. Apparatus and methods for multicomponent marine geophysical data gathering
US7167413B1 (en) * 2006-05-01 2007-01-23 Input/Output Towed streamer deghosting
WO2007149702A2 (fr) * 2006-06-23 2007-12-27 Geco Technology B.V. Estimation de bruit dans une flûte marine à détection de vecteur

Also Published As

Publication number Publication date
RU2012134326A (ru) 2014-02-27
RU2546997C2 (ru) 2015-04-10
EP2526444A2 (fr) 2012-11-28
CN102812382A (zh) 2012-12-05
US20140328138A1 (en) 2014-11-06
US20110182140A1 (en) 2011-07-28
CA2787296C (fr) 2018-11-20
WO2011091252A2 (fr) 2011-07-28
EP2526444B1 (fr) 2020-09-09
CA2787296A1 (fr) 2011-07-28
US9784860B2 (en) 2017-10-10
DK201270479A (en) 2012-08-15
US8730766B2 (en) 2014-05-20

Similar Documents

Publication Publication Date Title
WO2011091252A3 (fr) Système séismique doté d'un pouvoir de rejet de mouvements et de réflexions fantômes
WO2011150126A3 (fr) Déparasitage de données sismiques
WO2010129280A3 (fr) Traitement, guidé par pétrophysique, de données acoustiques lwd
WO2011046819A3 (fr) Ensemble de capteur comportant un capteur sismique, un capteur de pression et un processeur pour appliquer des premier et deuxième filtres numériques
GB2441195B (en) Marine seismic streamer having acoustic isolation between strength members and sensor mounting
EP2428821A3 (fr) Procédés et systèmes pour la détection de signal sismique
EA201170321A1 (ru) Способ подавления интерференционных помех в сейсмических данных с помощью системы записи с двумя типами датчиков
WO2012162111A3 (fr) Procédés et systèmes permettant de supprimer des signaux parasites lors de la détection de signaux sismiques
GB2436699B (en) System and method for determining positions of towed marine source-array elements
WO2014120300A3 (fr) Système et procédés de surveillance acoustique
WO2008103919A3 (fr) Détection améliorée de position par capteur unique
WO2011149613A3 (fr) Détection de signaux sismiques au moyen de capteurs à fibre optique répartis
WO2008079636A3 (fr) Élimination du bruit de données sismiques obtenues à partir de détecteurs sismiques remorqués
WO2011106035A3 (fr) Détection par échogramme d'états dermatologiques
WO2010004249A3 (fr) Détection basée sur la phase
WO2011103081A3 (fr) Système de sources sismiques larges
GB201113278D0 (en) Underwater detection apparatus
WO2010093557A3 (fr) Mesure de capteur de rotation permettant d'attenuer le bruit acquis pas un capteur place sur une flûte sismique
NO20084985L (no) System for reduksjon av falskt ekko for slepehydrofonoppstilling
MX2008016128A (es) Metodo y sistema para cancelar el ruido de medidas proporcionadas por sensores de un arrastrador de multiples componentes.
WO2010023434A3 (fr) Détection basée sur la phase
SA517380658B1 (ar) الكشف عن الأخطاء للمضاءلة الفعالة لأداة تسجيل أداء حفر حفرة بئر
GB2462195B (en) Method of summing dual-sensor towed streamer signals using seismic reflection velocities
WO2011103079A3 (fr) Système de communication entre plusieurs bateaux
GB2550705A (en) Ingestion monitoring system

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 201180013927.3

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11701727

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2011701727

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2787296

Country of ref document: CA

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2012134326

Country of ref document: RU